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The boost converter is optimized for current load up to 20mA and 3.3V to 15V selectable output voltage ... 055UMC_DCDC_01 is high-efficiency step-down DC-DC switching buck converter targeted for ...

If you want a refresher on how a buck converter — that is, a DC to DC converter that reduces a higher input voltage to the desired voltage — works we had a good brief video about that recently.